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Procedural macros have a peek function from the syn crate. macro_rules macros can stuff this into the pattern matching.

e.g.

https://turreta.com/2019/12/24/pattern-matching-declarative-...



But proc macros are limited by requiring another crate (unless things have changed in the last year). Sure, it’s just one extra crate in the project, but why must I be forced to?


Asked and answered in an adjacent comment.




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